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Physics
 Online Tutoring : Forum : Homework Help - Physical Sciences : Physics
Topic Topic: speed Post ReplyNew Question
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Moco8283
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Joined: 12 October 2007
Posts: 3
Posted: 12 October 2007 at 12:48am | IP Logged Quote Moco8283

A railroad car of mass m is moving at speed

v when it collides with a second railroad car

of mass M which is at rest. The two cars lock

together instantaneously and move along the

track.

What is the speed of the cars immediately

after the collision?

 

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Prasadb
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Joined: 29 September 2007
Location: India
Posts: 4
Posted: 16 October 2007 at 12:42am | IP Logged Quote Prasadb

Initial momentum = mv ....(1)

If we assume final velocity as V m/s,

Final momentum = (m+M) V .....(2)

As per conservation of Momentum principle

Initial momentum = Final momentum i.e 1=2

mv= (m+M) V

V= mv(m+M)

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